These changes introduce two new functions called (*qml.QJSEngine).NewGoType and (*qml.QJSEngine).ToGoType, that can be used (similiar to how core.NewQVariant1 and (*core.QVariant).ToGoType can be used) to convert Go objects and functions to *qml.QJSValues and vice versa.
This allows for a more natural communication between Go and Qml/JS and makes it possible to simply pass a Go structs to Qml/JS and then call Go methods on that object.
For this to work, the object passed to Qml/JS needs to implement the `Pointer() unsafe.Pointer` and `SetPointer(unsafe.Pointer)` functions atm.
Which means, since all Qt classes already implement these functions, that you can now use the whole binding from Qml/JS as well and theoretically create a full Qt application inside an QJSEngine as well. A few example applications almost entirely written in JS can be found here: https://github.com/therecipe/examples/tree/master/js/
Furthermore, the `widgets_playground` example (https://github.com/therecipe/widgets_playground) now fully works on desktop and mobile targets as well.
other changes:
* core.NewQVariant1 and (*core.QVariant).ToGoType now recognize json tags
* workaround for qtmoc issue related to named imports
* speed-up go module android docker deployments
* fix webengine related qtdeploy bug on macOS
* fix int overflow issue for arm docker images
* fix js docker images
* new docker images to make it easier to deploy to "embedded" armv6/armv7/arm64 systems such as Raspberry Pi, Orange Pi, Banana Pi, BeagleBone, BeagleBoard, ODROID, Asus Tinker Board, ...
* various minor fixes and cleanups
* support interface{} returns for js/wasm
* fix android builds on darwin
* support for the virtualkeyboard module
* fixes for docker image builds
* cleanup callback handling
* fix possible moc memory leaks
* new virtualkeyboard examples
